// DotGenerator.cs
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;
using System.Collections.Generic;
using System.Text;

namespace Bechamel
{
	
	public class DotGenerator : IComponent<AstTree, string>
	{
		readonly string baseDefinition = "graph DependencyGraph {" + Environment.NewLine;
		
		public event EventHandler<OutputChannelEventArgs<string>> OutputChannel;

		public void InputChannel(object sender, OutputChannelEventArgs<AstTree> e)
		{
			StringBuilder sb = new StringBuilder(baseDefinition);
			WalkTree(sb, e.Data);
			sb.Append(Environment.NewLine);
			sb.Append("}");

			if (OutputChannel != null)
				OutputChannel(this, new OutputChannelEventArgs<string>(sb.ToString()));
		}

		void WalkTree(StringBuilder acc, AstTree node)
		{
			//Console.WriteLine(node.Token.ToString() + " has " + node.Childs.Count + " childs");

            if (node.Token is INumberToken || node.Token is IBooleanToken)
            {
                acc.Append('\t');
                acc.Append('"');
                acc.Append(node.Token.ToString());
                acc.Append('"');
                acc.AppendLine(" [shape=box];");
            }

			foreach (AstTree child in node.Childs) {
				acc.Append('\t');
				acc.Append('"');
				acc.Append(node.Token.ToString());
				acc.Append('"');
				acc.Append(" -- ");
				acc.Append('"');
				acc.Append(child.Token.ToString());
				acc.Append('"');
				acc.AppendLine(";");
			}

			foreach (AstTree child in node.Childs) {
				WalkTree(acc, child);
			}
		}
	}
}
